<template>
  <div class="shopcart-warpper">
    <div class="shopcart">
      <div class="content" @click="toggleList">
        <div class="content-left">
          <div class="logo-wrapper">
            <div class="logo" :class="{'highlight': totalCount}"><i class="icon-shopping_cart"></i></div>
            <div class="num" v-show="totalCount">{{totalCount}}</div>
          </div>
          <div class="price" :class="{'highlight': totalPrice}">￥{{totalPrice}}</div>
          <div class="desc">另需配送费{{deliveryPrice}}元</div>
        </div>
        <div class="content-right" @click.stop.prevent="pay">
          <div class="pay" :class="payClass">
            {{payDesc}}
          </div>
        </div>
      </div>

      <div class="ball-container">
        <transition name="drop"
                    @before-enter="drop_beforeEnter"
                    @enter="drop_enter"
                    @afterEnter="drop_afterEnter" v-for="(ball, index) in balls" key="index">
          <div class="ball" v-show="ball.show">
            <div class="inner inner-hook"></div>
          </div>
        </transition>
      </div>

      <transition name="fold">
        <div class="shopcart-list" v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="empty">清空</span>
          </div>
          <div class="list-content" ref="listContent">
            <ul>
              <li class="food" v-for="food in selectFoods">
                <span class="name">{{food.name}}</span>
                <div class="price">
                  <span>￥{{food.price*food.count}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
    </div>
    <transition name="fade">
      <div class="list-mask" v-show="listShow" @click="toggleList"></div>
    </transition>
  </div>
</template>

<script>
  import BScroll from 'better-scroll';
  import cartcontrol from '../cartcontrol/cartcontrol';

  export default{
    props: ['deliveryPrice', 'minPrice', 'selectFoods'],
    components: {cartcontrol},
    data() {
      return {
        balls: [{show: false}, {show: false}, {show: false}, {show: false}, {show: false}],
        dropBalls: [],
        fold: true
      }
    },
    computed: {
      totalPrice() {
        let total = 0;
        this.selectFoods.forEach(function (food) {
          total += food.price * food.count;
        });
        return total;
      },
      totalCount() {
        let count = 0;
        this.selectFoods.forEach(function (food) {
          count += food.count;
        });
        return count;
      },
      payDesc() {
        if (this.totalPrice === 0) {
          return `￥${this.minPrice}元起送`;
        } else if (this.totalPrice < this.minPrice) {
          let diff = this.minPrice - this.totalPrice;
          return `还差￥${diff}元起送`;
        } else {
          return '去结算';
        }
      },
      payClass() {
        if (this.totalPrice < this.minPrice) {
          return 'no-enough';
        } else {
          return 'enough';
        }
      },
      listShow() {
        if (!this.totalCount) {
          this.fold = true;
          return false;
        }
        let show = !this.fold;
        if (show) {
          this.$nextTick(function () {
            if(!this.scroll){
              this.scroll = new BScroll(this.$refs.listContent, {
                click: true
              });
            }else{
              this.scroll.refresh();
            }
          });
        }
        return show;
      }
    },
    methods: {
      toggleList() {
        if (!this.totalCount) {
          return;
        }
        this.fold = !this.fold;
      },
      empty() {
        this.selectFoods.forEach(function (food) {
          food.count = 0;
        });
      },
      pay() {
        if(this.totalPrice < this.minPrice) return;
        // 支付
        window.alert(`支付￥${this.totalPrice}`);
      },
      drop(el) {
        for (let i = 0; i < this.balls.length; i++) {
          let ball = this.balls[i]
          if (!ball.show) {
            ball.show = true;
            ball.el = el;
            this.dropBalls.push(ball);
            return;
          }
        }
      },
      drop_beforeEnter(el) {
        let count = this.balls.length;
        while (count--) {
          let ball = this.balls[count];
          if (ball.show) {
            let rect = ball.el.getBoundingClientRect();
            let x = rect.left - 32;
            let y = -(window.innerHeight - rect.top - 22);
            el.style.display = '';
            el.style.webkitTransform = `translate3D(0,${y}px,0)`;
            el.style.transform = `translate3D(0,${y}px,0)`;

            let inner = el.getElementsByClassName('inner-hook')[0];
            inner.style.webkitTransform = `translate3D(${x}px,0,0)`;
            inner.style.transform = `translate3D(${x}px,0,0)`;
          }
        }
      },
      drop_enter(el) {
        /* eslint-disable no-unused-vars */
        let rf = el.offsetHeight; // 触发浏览器重新绘制
        this.$nextTick(function () {
          el.style.webkitTransform = 'translate3D(0,0,0)';
          el.style.transform = 'translate3D(0,0,0)';

          let inner = el.getElementsByClassName('inner-hook')[0];
          inner.style.webkitTransform = 'translate3D(0,0,0)';
          inner.style.transform = 'translate3D(0,0,0)';
        })
      },
      drop_afterEnter(el) {
        let ball = this.dropBalls.shift();
        if (ball) {
          ball.show = false;
          el.style.display = 'none';
        }
      }
    }
  }
</script>

<style lang="scss">
  @import "../../common/sass/mixin";

  .shopcart {
    position: fixed;
    left: 0;
    bottom: 0;
    z-index: 50;
    width: 100%;
    height: 48px;
    background: #000;
    .content {
      display: flex;
      background: #141d27;
      font-size: 0;
      .content-left {
        flex: 1;
        .logo-wrapper {
          display: inline-block;
          position: relative;
          top: -10px;
          margin: 0 12px;
          padding: 6px;
          width: 56px;
          height: 56px;
          box-sizing: border-box;
          vertical-align: top;
          border-radius: 50%;
          background: #141d27;
          .logo {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background: #2b343c;
            text-align: center;
            &.highlight {
              background: rgb(0, 160, 220);
              .icon-shopping_cart {
                color: #fff;
              }
            }
            .icon-shopping_cart {
              line-height: 44px;
              font-size: 24px;
              color: #80858a;
            }
          }
          .num {
            position: absolute;
            top: 0;
            right: 0;
            width: 24px;
            height: 16px;
            line-height: 16px;
            text-align: center;
            border-radius: 16px;
            font-size: 9px;
            font-weight: 700;
            color: #fff;
            background: rgb(240, 20, 20);
            box-shadow: 0 4px 8px 0 rgba(0, 0, 0, .4);
          }
        }
        .price {
          display: inline-block;
          vertical-align: top;
          line-height: 12px;
          margin-top: 12px;
          padding: 6px 12px;
          border-right: 1px solid rgba(255, 255, 255, 0.1);
          box-sizing: border-box;
          font-size: 16px;
          font-weight: 700;
          color: rgba(255, 255, 255, 0.4);
          &.highlight {
            color: #fff;
          }
        }
        .desc {
          display: inline-block;
          vertical-align: top;
          margin: 12px 0 0 12px;
          line-height: 24px;
          color: rgba(255, 255, 255, .4);
          font-size: 10px;
        }
      }
      .content-right {
        flex: 0 0 105px;
        width: 105px;
        .pay {
          line-height: 48px;
          height: 48px;
          text-align: center;
          font-size: 12px;
          color: rgba(255, 255, 255, .4);
          font-weight: 700;
          background: #2b333b;
          &.not-enough {
            background: #2b333b;
          }
          &.enough {
            background: #00b43c;
            color: #fff;
          }
        }
      }
    }
    .ball-container {
      .ball {
        position: fixed;
        left: 32px;
        bottom: 22px;
        z-index: 200;

        &.drop-enter-active, &.drop-leave-active {
          transition: all .4s cubic-bezier(.49, -0.29, .75, .41);
          transform: translate3D(0, 0, 0);
        }

        .inner {
          width: 16px;
          height: 16px;
          border-radius: 50%;
          background: rgb(0, 160, 220);
          transition: all .4s linear;
        }
      }
    }
    .shopcart-list {
      position: absolute;
      bottom: 100%;
      left: 0;
      z-index: -1;
      width: 100%;

      &.fold-enter-active, &.fold-leave-active {
        transition: all .5s ease;
        transform: translate3D(0, 0, 0);
      }
      &.fold-enter, &.fold-leave-active {
        transform: translate3D(0, 100%, 0);
      }

      .list-header {
        height: 40px;
        line-height: 40px;
        padding: 0 18px;
        background: #f3f5f7;
        border-bottom: 1px solid rgba(7, 17, 27, .1);
        .title {
          float: left;
          font-size: 14px;
          color: rgb(7, 17, 27);
        }
        .empty {
          float: right;
          font-size: 12px;
          color: rgb(0, 160, 220);
        }
      }
      .list-content {
        padding: 0 18px;
        max-height: 217px;
        overflow: hidden;
        background: #ffffff;
        .food {
          position: relative;
          padding: 12px 0;
          box-sizing: border-box;
          @include border-1px(rgba(7, 17, 27, .1));
          .name {
            line-height: 24px;
            font-size: 14px;
            color: rgb(7, 17, 27);
          }
          .price {
            position: absolute;
            right: 90px;
            bottom: 12px;
            line-height: 24px;
            font-size: 14px;
            font-weight: 700;
            color: rgb(240, 20, 20);
          }
          .cartcontrol-wrapper {
            position: absolute;
            right: 0;
            bottom: 6px;
          }
        }
      }
    }
  }
  .list-mask{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 40;
    background: rgba(7,17,27,.6);
    opacity: 1;
    -webkit-backdrop-filter: blur(10px);

    &.fade-enter-active, &.fade-leave-active {
      transition: all .5s ease;
    }
    &.fade-enter, &.fade-leave-active {
      opacity: 0;
    }
  }
</style>
